Improve Security Benchmarking Indexing and Querying Configurations (e…

…lastic#608)

Two changes:

 *  Increase the bulk_indexing_clients to 100 in order to better maximize our throughput on a 3-node benchmark.
  * Scope time ranges in the solutions/security track to overlap with the presence of our static data. We have data in all 5 Beats indices dated from 2020-01-01 00:00:00 to at least 01:00:00. Currently, the query_max_date is 2020-01-02, so it would be very rarely that our random query duration lengths would overlap with the presence of actual data on the cluster.

night_rally/resources/race-configs-group-3.json

@@ -369,6 +369,8 @@
                   "security"
                 ],
                 "track-params": {
+                  "query_max_date": "2020-01-01T01:00:00Z",
+                  "bulk_indexing_clients": 100,
                   "number_of_replicas": 1,
                   "wait_for_status": "green"
                 },